A348117 a(n) is the number of (strict) chains of subspaces with ends 0 and (F_3)^n, counted up to coordinate permutation.

1, 4, 26, 334, 8474, 511198, 81719819

Offset: 1

Author

Álvar Ibeas, Oct 01 2021

Keywords

• more
• nonn

Crossrefs

Cf. A348114, A036038, A347841.

Formula

a(n) = Sum_{L partition of n} A348114(n, L) * A036038(len(L), sig(L)), where sig(L) is the partition composed by the part multiplicities of L.